製品の説明

生物活性

The 50% inhibitory concentrations (IC50) for Ganetespib against malignant mast cell lines are 10-50 times lower than that for 17-AAG, indicating that triazolone class of HSP90 inhibitors likely exhibits greater potency than geldanamycin based inhibitors. [1] Ganetespib inhibits MG63 cell lines with IC50 of 43 nM. [1] Ganetespib binds to the ATP-binding domain at the N-terminus of Hsp90 and serves as a potent Hsp90 inhibitor by causing degradation of multiple oncogenic Hsp90 client proteins including HER2/neu, mutated EGFR, Akt, c-Kit, IGF-1R, PDGFRα, Jak1, Jak2, STAT3, STAT5, HIF-1α, CDC2 and c-Met as well as Wilms' tumor 1. [2] Ganetespib, at low nanomolar concentrations, potently arrests cell proliferation and induces apoptosis in a wide variety of human cancer cell lines, including many receptor tyrosine kinase inhibitor- and tanespimycin-resistant cell lines. Ganetespib exhibits potent cytotoxicity in a range of solid and hematologic tumor cell lines, including those that express mutated kinases that confer resistance to small-molecule tyrosine kinase inhibitors. [3] Ganetespib treatment rapidly caused the degradation of known Hsp90 client proteins, exhibits superior potency to the ansamycin inhibitor 17-AAG, and shows sustained activity even with short exposure times.[3] In anohter study, Ganetespib induces apoptosis of malignant canine mast cell lines. Ganetespib is active at significantly lower concentrations for C2 and BR canine malignant mast cells with IC50 of 19 and 4 nM, respectively, while 17-AAG inhibits C2 and BR canine malignant mast cells with IC50 of 958 and 44 nM, respectively. [4] Both the expression of WT and mutant Kit are downregulated by 100 nM Ganetespib after 24 hours in all lines treated including C2 and BMCMCs cells. However, no effects on PI3K or HSP90 expression are observed following treatment with Ganetespib.[4]

In vivo試験

Administration of Ganetespib leads to significant tumor shrinkage in several tumor xenograft models in mice and appears to be less toxic. Furthermore Ganetespib demonstrated better tumor penetration compared with tanespimycin.[2] Ganetespib inhibits in vivo tumor growth in both malignant mast cell and OSA xenograft models. Ganetespib significantly inhibits tumor growth when dosed with two repeating cycles of 25 mg/kg/day for 3 days, with a %T/C value of 18. Ganetespib is well-tolerated, with the vehicle and Ganetespib groups having average bodyweight changes relative to the start of the study of +0.3% and -8.1% on day 17, respectively.[4]

臨床試験

Ganetespib has entered in a phase II clinical trials in the treatment of non small cell lung cancer.

特集

推薦された実験操作 (公開の文献だけ)

A total of 1.5 × 103 OSA cells are seeded in 96-well plates in 10% serum-containing complete medium and incubated overnight to determine the 50% inhibitory concentrations. Plates are, harvested at day 5 following 0.001, 0.005, 0.01, 0.05, 0.1, 0.5 and 1 μM Ganetespib, treatment and analyzed. Fluorescence measurements are made using a plate reader with excitation at 485 nm and emission detection at 530 nm. Relative cell number is calculated as a percentage of the control wells: absorbance of sample/absorbance of DMSO treated cells × 100.

* Please note that Selleck tests the solubility of all compounds in-house, and the actual solubility may differ slightly from published values. This is normal and is due to slight batch-to-batch variations.

Conversion of different model animals based on BSA (Value based on data from FDA Draft Guidelines)

Species

Baboon

Dog

Monkey

Rabbit

Guinea pig

Rat

Hamster

Mouse

Weight (kg)

12

10

3

1.8

0.4

0.15

0.08

0.02

Body Surface Area (m2)

0.6

0.5

0.24

0.15

0.05

0.025

0.02

0.007

Km factor

20

20

12

12

8

6

5

3

Animal A (mg/kg) = Animal B (mg/kg) multiplied by

Animal B Km

Animal A Km

For example, to modify the dose of resveratrol used for a mouse (22.4 mg/kg) to a dose based on the BSA for a rat, multiply 22.4 mg/kg by the Km factor for a mouse and then divide by the Km factor for a rat. This calculation results in a rat equivalent dose for resveratrol of 11.2 mg/kg.

* <1 mg/ml means slightly soluble or insoluble.* Please note that Selleck tests the solubility of all compounds in-house, and the actual solubility may differ slightly from published values. This is normal and is due to slight batch-to-batch variations.

To investigate whether PRKD2 stability is affected after pharmacologic HSP90 inhibition, eight human cancer cell lines representing six different tumor types (breast cancer, pancreatic cancer, lung cancer, colon cancer, acutemyeloid leukemia, and glioblastoma) were incubated for 24 hours with increasing concentrations of two different compounds: PU-H71, an optimized water soluble member of the purine class of HSP90 inhibitors and STA-9090, a resor-cinol-containing triazole molecule with a novel chemical structure, both unrelated to the geldanamycin class of HSP90 inhibitors. Both inhibitors caused dose-dependent degradation of PRKD2 in all tumor cell lines. STA-9090 was associated with increased apoptosis as revealed by augmented PARP and caspase-9 cleavage in all tumor cell lines.